Great pyraneese are terribly inefficiant for anything but big farm, as they eat way to much can't take heat, way to slow, want to wanter at ambling pace to get exercise and if can't get fatter lazier slower then heat stroke more easy. Seen and continue to see so many abandoned, abused and rehomed as they run with packs as usually kept alone, wander and don't protect flocks, and even greatly are stock killers themselves, especially chickens as they see them as snacks and toys that are easy targets. my collies have herded them up routinely right with flocks after the GPD have broken out and wandered acres to miles away. Breeds I've listed as best seen, also will herd up in safe area when danger around, and bring back strays from flock. so herding them back home/keeping home seems prefferable to dog that has no bred in boundries and can lead astry and go through electric fencing as easy as go through others. ive never needed fences with collies or sheperds, just leash train to perimeter, and teach recal and no if or when they try to go past. fyi other land preds and coyote can get easily over anything but nine foot fence high, that isn't buried four feet deep as well. my collies (one was border/pit), pluck BOPs out of air.